What do you think , should i find another monastery or shoul i continue with carthusians.

Here’s a question. If your superior, regardless of the Order, told you, “Brother ____, please stand while you receive communion”, what do you think is more important? Your posture, or obedience? Could you stand, despite not liking it?

Either posture is permitted, though every Catholic has the right to receive while kneeling. However, if you’re dealing with the Carthusian rite, then it’s whatever the Carthusian rite prescribes. And like you said, obedience is what’s important. If your Superior says to kneel, you kneel. Stand, you stand. Trust him.

Carthusians receive communion while standing. I think this just ruined my vocation.

You should spend some time seriously reflecting on what this episode tells you about whether you have a vocation, and if so, whether it is with the Carthusians.
For your vocation to be “ruined” by this Order doing something that is approved by the Church is very concerning.